I was able to run the ubuntu-drivers install command without problems on a liveusb (kubuntu 20.04, the same as my system). There seems to be something wrong with my installation. I'm sorry for posting this as a bug.
I was able to run the ubuntu-drivers install command without problems on a liveusb (kubuntu 20.04, the same as my system). There seems to be something wrong with my installation. I'm sorry for posting this as a bug.